Fix some Texinfo markup in manuals

* doc/emacs/macos.texi (Mac / GNUstep Customization):
* doc/lispintro/emacs-lisp-intro.texi (condition-case):
* doc/lispref/control.texi (pcase Macro):
* doc/lispref/debugging.texi (Internals of Debugger):
* doc/lispref/internals.texi (Building Emacs):
* doc/lispref/modes.texi (Imenu):
(Parser-based Font Lock, Parser-based Indentation):
* doc/lispref/parsing.texi (Retrieving Nodes, Tree-sitter C API):
* doc/lispref/processes.texi (Network, Bindat Types):
* doc/lispref/searching.texi (Rx Functions):
* doc/lispref/text.texi (Replacing):
* doc/lispref/windows.texi (Textual Scrolling):
* doc/misc/calc.texi (Killing From Stack, Customizing Calc):
* doc/misc/cc-mode.texi (Misc Font Locking, List Line-Up):
* doc/misc/ede.texi (ede-cpp-root-project)
(ede-proj-target-makefile, ede-sourcecode):
* doc/misc/ert.texi (Running Tests in Batch Mode):
* doc/misc/eudc.texi (Emacs-only Configuration, The Server Hotlist):
* doc/misc/eww.texi (Advanced):
* doc/misc/flymake.texi (Starting Flymake)
(Proc customization variables):
* doc/misc/tramp.texi (File name completion):
* doc/misc/gnus.texi (Summary Buffer Lines, Gnus Registry Setup)
(Fancy splitting to parent, Customizing the IMAP Connection)
(Mail Source Specifiers, Agent as Cache): Consistently mark up nil
and t as @code.  Also fix the markup and wording of some surrounding
text (bug#64016).

* doc/lispref/display.texi (SVG Images, Icons):
* doc/lispref/modes.texi (Customizing Keywords): Prefer ASCII
apostrophe over Unicode right single quotation mark.

9 files changed, 86 insertions, 79 deletions

diff --git a/doc/misc/calc.texi b/doc/misc/calc.texi
index 3b525996d6f..3ba1a9d4d15 100644
--- a/doc/misc/calc.texi
+++ b/doc/misc/calc.texi
@@ -29875,10 +29875,10 @@ with no argument copies only the number itself into the kill ring, whereas
 @kbd{C-k} with a prefix argument of 1 copies the number with its trailing
 newline.
 
-You can customize @code{calc-kill-line-numbering} to nil to exclude
-line numbering from kills and copies made by @code{calc-kill} and
-@code{calc-copy-as-kill}.  This option does not affect calc kill and
-copy commands which operate on the region, as that would not make
+You can customize @code{calc-kill-line-numbering} to @code{nil} to
+exclude line numbering from kills and copies made by @code{calc-kill}
+and @code{calc-copy-as-kill}.  This option does not affect calc kill
+and copy commands which operate on the region, as that would not make
 sense.
 
 @node Yanking Into Stack
@@ -35590,11 +35590,11 @@ The default value of @code{calc-note-threshold} is 1.
 See @ref{Displaying Selections}.@*
 The variable @code{calc-highlight-selections-with-faces}
 determines how selected sub-formulas are distinguished.
-If @code{calc-highlight-selections-with-faces} is nil, then
+If @code{calc-highlight-selections-with-faces} is @code{nil}, then
 a selected sub-formula is distinguished either by changing every
 character not part of the sub-formula with a dot or by changing every
 character in the sub-formula with a @samp{#} sign.
-If @code{calc-highlight-selections-with-faces} is t,
+If @code{calc-highlight-selections-with-faces} is @code{t},
 then a selected sub-formula is distinguished either by displaying the
 non-selected portion of the formula with @code{calc-nonselected-face}
 or by displaying the selected sub-formula with
diff --git a/doc/misc/cc-mode.texi b/doc/misc/cc-mode.texi
index 3a808619868..888a51e0e15 100644
--- a/doc/misc/cc-mode.texi
+++ b/doc/misc/cc-mode.texi
@@ -2191,10 +2191,10 @@ foo& bar
 
 @defvar c-asymmetry-fontification-flag
 @vindex asymmetry-fontification-flag @r{(c-)}
-When @code{c-asymmetry-fontification-flag} is non-@code{nil} (which it is by
-default), code like the above, with white space either before or after
-the operator, but not both, is fontified as a declaration.  When the
-variable is nil, such a construct gets the default face.
+When @code{c-asymmetry-fontification-flag} is non-@code{nil} (which it
+is by default), code like the above, with white space either before or
+after the operator, but not both, is fontified as a declaration.  When
+the variable is @code{nil}, such a construct gets the default face.
 @end defvar
 
 When the construct is an expression there will often be white space
@@ -5998,7 +5998,7 @@ three syntactic symbols, @code{arglist-cont-nonempty},
 List Symbols}).
 
 This function is intended for use in a list.  If the construct being
-analyzed isn't like the preceding, the function returns nil.
+analyzed isn't like the preceding, the function returns @code{nil}.
 Otherwise it returns the function
 @code{c-lineup-arglist-intro-after-paren}, which the caller then uses
 to perform indentation.
@@ -6042,8 +6042,8 @@ also has a syntactic element with the symbol @code{brace-list-entry}
 (@pxref{Brace List Symbols}).
 
 This function is intended for use in a list.  If the above structure
-isn't present, the function returns nil, allowing a different offset
-specification to indent the line.
+isn't present, the function returns @code{nil}, allowing a different
+offset specification to indent the line.
 
 @workswith{} @code{brace-list-intro}.
 @end defun
@@ -6085,8 +6085,8 @@ returning the symbol @code{c-lineup-arglist-intro-after-paren}, which
 the caller then uses to perform the indentation.
 
 This function is intended for use in a list.  If the above structure
-isn't present, the function returns nil, allowing a different offset
-specification to indent the line.
+isn't present, the function returns @code{nil}, allowing a different
+offset specification to indent the line.
 
 @workswith{} @code{brace-list-intro}.
 @end defun
diff --git a/doc/misc/ede.texi b/doc/misc/ede.texi
index e4ec72af5cd..d49d2296aa7 100644
--- a/doc/misc/ede.texi
+++ b/doc/misc/ede.texi
@@ -1896,19 +1896,19 @@ Make sure the @code{:file} is fully expanded.
 @end deffn
 
 @deffn Method ede-preprocessor-map :AFTER this
-Get the pre-processor map for project @var{THIS}.
+Get the pre-processor map for project @var{this}.
 @end deffn
 
 @deffn Method ede-cpp-root-header-file-p :AFTER proj name
-Non @code{nil} if in @var{PROJ} the filename @var{NAME} is a header.
+Non-@code{nil} if in @var{proj} the filename @var{name} is a header.
 @end deffn
 
 @deffn Method ede-system-include-path :AFTER this
-Get the system include path used by project @var{THIS}.
+Get the system include path used by project @var{this}.
 @end deffn
 
 @deffn Method ede-expand-filename-impl :AFTER proj name
-Within this project @var{PROJ}, find the file @var{NAME}.
+Within this project @var{proj}, find the file @var{name}.
 This knows details about or source tree.
 @end deffn
 
@@ -2796,7 +2796,7 @@ File name of generated Makefile.
 Type: @code{boolean} @*
 Default Value: @code{t}
 
-Non @code{nil} means the rule created is part of the all target.
+Non-@code{nil} means the rule created is part of the all target.
 Setting this to @code{nil} creates the rule to build this item, but does not
 include it in the @code{all:} rule.
 
@@ -3888,10 +3888,10 @@ themselves.
 Type: @code{boolean} @*
 Default Value: @code{nil}
 
-Non @code{nil} if this sourcecode type uses subdirectores.
-If sourcecode always lives near the target creating it, this should be nil.
-If sourcecode can, or typically lives in a subdirectory of the owning
-target, set this to t.
+Non-@code{nil} if this sourcecode type uses subdirectores.  If
+sourcecode always lives near the target creating it, this should be
+@code{nil}.  If sourcecode can, or typically lives in a subdirectory
+of the owning target, set this to @code{t}.
 
 @item :garbagepattern
 Type: @code{list} @*
diff --git a/doc/misc/ert.texi b/doc/misc/ert.texi
index fd96fcf8b8c..a6b62a058f2 100644
--- a/doc/misc/ert.texi
+++ b/doc/misc/ert.texi
@@ -409,13 +409,13 @@ emacs -batch -l ert -l my-tests.el \
 @end example
 
 @vindex ert-batch-backtrace-line-length
-Even modest settings for @code{print-level} and @code{print-length} can
-produce extremely long lines in backtraces, however, with attendant
-pauses in execution progress.  Set
-@code{ert-batch-backtrace-line-length} to t to use the value of
-@code{backtrace-line-length}, @code{nil} to stop any limitations on backtrace
-line lengths (that is, to get full backtraces), or a positive integer to
-limit backtrace line length to that number.
+Even modest settings for @code{print-level} and @code{print-length}
+can produce extremely long lines in backtraces, however, with
+attendant pauses in execution progress.  Set
+@code{ert-batch-backtrace-line-length} to @code{t} to use the value of
+@code{backtrace-line-length}, @code{nil} to stop any limitations on
+backtrace line lengths (that is, to get full backtraces), or a
+positive integer to limit backtrace line length to that number.
 
 @vindex ert-quiet
 By default, ERT in batch mode is quite verbose, printing a line with
diff --git a/doc/misc/eudc.texi b/doc/misc/eudc.texi
index 743d7da946b..d82dec971cd 100644
--- a/doc/misc/eudc.texi
+++ b/doc/misc/eudc.texi
@@ -374,7 +374,7 @@ LDAP:
 Specifying the function @code{ldap-password-read} for @code{passwd}
 will cause Emacs to prompt interactively for the password.  The
 password will then be validated and cached, unless
-@code{password-cache} is nil.  You can customize
+@code{password-cache} is @code{nil}.  You can customize
 @code{password-cache-expiry} to control the duration for which the
 password is cached.  If you want to clear the cache, call
 @code{password-reset}.
@@ -1023,9 +1023,9 @@ current server to the list with the command @kbd{M-x
 eudc-bookmark-current-server}.  The list is contained in the variable
 @code{eudc-server-hotlist} which is stored in and retrieved from the
 file designated by @code{eudc-options-file}, or normal Emacs
-initialization if @code{eudc-ignore-options-file} is non-nil.  EUDC
-also provides a facility to edit the hotlist interactively (@pxref{The
-Hotlist Edit Buffer}).
+initialization if @code{eudc-ignore-options-file} is non-@code{nil}.
+EUDC also provides a facility to edit the hotlist interactively
+(@pxref{The Hotlist Edit Buffer}).
 
 The hotlist is also used to make queries on multiple servers
 successively (@pxref{Multi-server Queries}).  The order in which the
@@ -1041,18 +1041,18 @@ Add the current server to the hotlist of servers
 @end deffn
 
 @defvar eudc-ignore-options-file
-If non-nil, then EUDC ignores @code{eudc-options-file} and warns or
+If non-@code{nil}, EUDC ignores @code{eudc-options-file} and warns or
 issues an error when an attempt is made to use it.  Most users should
 set this, and keep their EUDC configuration in the main Emacs
-initialization file instead.  The separate eudc-options file has
-created confusion for users in the past.
+initialization file instead.  The separate @file{eudc-options} file
+has created confusion for users in the past.
 @end defvar
 
 @defvar eudc-options-file
 The name of a file where EUDC stores its internal variables (the
 hotlist and the current server).  EUDC will try to load that file upon
 initialization so, if you choose a file name different from the
-defaults @file{~/.emacs.d/eudc-options}, be sure to set this variable
+default @file{~/.emacs.d/eudc-options}, be sure to set this variable
 to the appropriate value @emph{before} EUDC is itself loaded.
 @end defvar
 
diff --git a/doc/misc/eww.texi b/doc/misc/eww.texi
index bc556ed88e2..1a5688b0358 100644
--- a/doc/misc/eww.texi
+++ b/doc/misc/eww.texi
@@ -367,8 +367,8 @@ point positions or the actual Web page contents.
 The latter, however, tend to be overly large to preserve in the
 desktop file, so they get omitted, thus rendering the respective
 entries entirely equivalent.  By default, such duplicate entries are
-not saved.  Setting @code{eww-desktop-remove-duplicates} to nil will
-force EWW to save them anyway.
+not saved.  Setting @code{eww-desktop-remove-duplicates} to @code{nil}
+will force EWW to save them anyway.
 
 @vindex eww-restore-desktop
   Restoring EWW buffers' contents may prove to take too long to
diff --git a/doc/misc/flymake.texi b/doc/misc/flymake.texi
index 03d296a1d42..c7c46896709 100644
--- a/doc/misc/flymake.texi
+++ b/doc/misc/flymake.texi
@@ -115,11 +115,11 @@ Syntax checks happen ``on-the-fly''.  Each check is started whenever:
 @itemize @bullet
 @item
 @code{flymake-mode} is started, unless
-@code{flymake-start-on-flymake-mode} is nil;
+@code{flymake-start-on-flymake-mode} is @code{nil};
 
 @item
 the buffer is saved, unless @code{flymake-start-on-save-buffer} is
-nil;
+@code{nil};
 
 @item
 some changes were made to the buffer more than @code{0.5} seconds ago
@@ -876,13 +876,18 @@ Patterns for error/warning messages in the form @code{(regexp file-idx
 line-idx col-idx err-text-idx)}.  @xref{Parsing the output}.
 
 @item flymake-proc-diagnostic-type-pred
-A function to classify a diagnostic text as particular type of error.
-Should be a function taking an error text and returning a diagnostic
-symbol (@pxref{Flymake error types}).  If non-@code{nil} is returned but
-there is no such symbol in that table, a warning is assumed.  If nil
-is returned, an error is assumed.  Can also be a regular expression
-that should match only warnings.  This variable replaces the old
-@code{flymake-warning-re} and @code{flymake-warning-predicate}.
+A function to classify a diagnostic text as a particular type of
+error.  The value of this variable should be a function taking an
+error text and returning a diagnostic symbol (@pxref{Flymake error
+types}).  If it returns a non-@code{nil} value but there is no such
+symbol in that table, the text is interpreted as a warning.  If the
+function returns @code{nil}, the text is assumed to be an error.
+
+The value of this variable can alternatively be a regular expression
+that should match only warnings.
+
+This variable replaces the old @code{flymake-warning-re} and
+@code{flymake-warning-predicate}.
 
 @item flymake-proc-compilation-prevents-syntax-check
 A flag indicating whether compilation and syntax check of the same
diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index d77d4be1bee..e995469ee3d 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -5014,14 +5014,14 @@ the @code{a} spec.
 @item L
 Number of lines in the article.
 @item Z
-Retrieval Score Value (RSV) of the article; nil if not in an nnselect
-group.
+Retrieval Score Value (RSV) of the article; @code{nil} if not in an
+nnselect group.
 @item G
-Originating group name of the article; nil if not in an nnselect
-group.
+Originating group name of the article; @code{nil} if not in an
+nnselect group.
 @item g
-Short form of the originating group name of the article; nil if not in
-an nnselect group.
+Short form of the originating group name of the article; @code{nil} if
+not in an nnselect group.
 @item c
 Number of characters in the article.  This specifier is not supported
 in some methods (like nnfolder).
@@ -14568,18 +14568,20 @@ requires using the @file{oauth2.el} library.)
 @vindex nnimap-expunge
 @item nnimap-expunge
 When to expunge deleted messages.  If @code{never}, deleted articles
-are marked with the IMAP @code{\\Delete} flag but not automatically
-expunged. If @code{immediately}, deleted articles are immediately expunged
-(this requires the server to support the UID EXPUNGE command). If
-@code{on-exit}, deleted articles are flagged, and all flagged articles are
-expunged when the group is closed.
-
-For backwards compatibility, this variable may also be set to t
-or nil. If the server supports UID EXPUNGE, both t and nil are
-equivalent to @code{immediately}. If the server does not support UID
-EXPUNGE nil is equivalent to @code{never}, while t will immediately
-expunge ALL articles that are currently flagged as deleted
-(i.e., potentially not only the article that was just deleted).
+are marked with the @acronym{IMAP} @code{\\Delete} flag but not
+automatically expunged.  If @code{immediately}, deleted articles are
+immediately expunged (this requires the server to support the
+@code{UID EXPUNGE} command).  If @code{on-exit}, deleted articles are
+flagged, and all flagged articles are expunged when the group is
+closed.
+
+For backwards compatibility, this variable may also be set to @code{t}
+or @code{nil}.  If the server supports @code{UID EXPUNGE}, both
+@code{t} and @code{nil} are equivalent to @code{immediately}.  If the
+server does not support @code{UID EXPUNGE}, @code{nil} is equivalent
+to @code{never}, while @code{t} will immediately expunge @emph{all}
+articles that are currently flagged as deleted (i.e., potentially not
+only the article that was just deleted).
 
 @vindex nnimap-streaming
 @item nnimap-streaming
@@ -15296,9 +15298,9 @@ Two example maildir mail sources:
 @end lisp
 
 @item imap
-Get mail from a @acronym{IMAP} server.  If you don't want to use
+Get mail from an @acronym{IMAP} server.  If you don't want to use
 @acronym{IMAP} as intended, as a network mail reading protocol (i.e.,
-with nnimap), for some reason or other, Gnus let you treat it similar
+with nnimap), for some reason or other, Gnus lets you treat it similar
 to a @acronym{POP} server and fetches articles from a given
 @acronym{IMAP} mailbox.  @xref{Using IMAP}, for more information.
 
@@ -19404,7 +19406,7 @@ If you so desire, you can configure the agent (see @code{gnus-agent-cache}
 @pxref{Agent Variables}) to always download headers and articles while
 plugged.  Gnus will almost certainly be slower, but it will be kept
 synchronized with the server.  That last point probably won't make any
-sense if you are using a nntp or nnimap back end.
+sense if you are using an nntp or nnimap back end.
 
 @node Agent Expiry
 @subsection Agent Expiry
@@ -26369,7 +26371,7 @@ If this option is non-@code{nil}, the registry will register all messages, as
 you see them.  This is important to making split-to-parent and
 Message-ID references work correctly, as the registry needs to know
 where all messages are, but it can slow down group opening and the
-saving of Gnus.  If this option is nil, entries must be created
+saving of Gnus.  If this option is @code{nil}, entries must be created
 manually, for instance by storing a custom flag or keyword for the
 message.
 @end defvar
@@ -26391,8 +26393,8 @@ This option specifies how registry entries are sorted during pruning.
 If a function is given, it should sort least valuable entries first,
 as pruning starts from the beginning of the list.  The default value
 is @code{gnus-registry-sort-by-creation-time}, which proposes the
-oldest entries for pruning.  Set to nil to perform no sorting, which
-will speed up the pruning process.
+oldest entries for pruning.  Set to @code{nil} to perform no sorting,
+which will speed up the pruning process.
 @end defvar
 
 @defvar gnus-registry-cache-file
@@ -26465,10 +26467,10 @@ have to put a rule like this:
 
 in your fancy split setup.
 
-If @code{gnus-registry-register-all} is non-@code{nil} (the default), the
-registry will perform splitting for all messages.  If it is nil,
-splitting will only happen for children of messages you've explicitly
-registered.
+If @code{gnus-registry-register-all} is non-@code{nil} (the default),
+the registry will perform splitting for all messages.  If it is
+@code{nil}, splitting will only happen for children of messages you've
+explicitly registered.
 
 In addition, you may want to customize the following variables.
 
diff --git a/doc/misc/tramp.texi b/doc/misc/tramp.texi
index f9617f7a5cd..6ed7e0ac032 100644
--- a/doc/misc/tramp.texi
+++ b/doc/misc/tramp.texi
@@ -3553,7 +3553,7 @@ completion lists.  If you want to suppress this completion because
 there are invalid entries in the persistency file, for example if the
 host configuration changes often, or if you plug your laptop to
 different networks frequently, you can set the user option
-@code{tramp-completion-use-cache} to nil.
+@code{tramp-completion-use-cache} to @code{nil}.
 
 After remote host name completion comes completion of file names on
 the remote host.  It works the same as with local host file completion